Abstract: Dynamic resilient modulus is a strength index, it can reflect dynamic characteristic of subgrade. This research gathers the test data of dynamic resilient modulus and compaction degree of same construction conditions, then get an empirical equation of the relationship between dynamic resilient modulus and compaction degree by means of the regression analysis, then a relationship of dynamic resilient modulus and degree of compaction in soilrock embankment is studied according to a large numbers of simulation tests. Finally using the relation equation controls fieldwork quality testing. The result of tests shows the model of loglinear can reflect the relationship between dynamic resilient modulus and compaction degree though 4d and Grubbs method test. The compactness of subgrade can be evaluated nondestructively by using the dynamic resilient modulus testing technique.